Domanda del libro di testo
Ethanol is a possible fuel. Use average bond energies to calculate ΔHrxn for the combustion of ethanol. CH3CH2OH(g) + 3 O2(g) → 2 CO2(g) + 3 H2O(g)
2906
views
Ch.10 - Chemical Bonding I: The Lewis Model
Tro6th EditionChemistry: A Molecular ApproachISBN: 9780137832217
Non è quello che usi tu?Cambia libro di testoScegli un libro di testo diverso
TOC.tableOfContents
- Ch.1 - Matter, Measurement & Problem Solving118
- Ch.2 - Atoms & Elements106
- Ch.3 - Molecules and Compounds131
- Ch.4 - Chemical Reactions and Chemical Quantities56
- Ch.5 - Introduction to Solutions and Aqueous Solutions82
- Ch.6 - Gases114
- Ch.7 - Thermochemistry96
- Ch.8 - The Quantum-Mechanical Model of the Atom60
- Ch.9 - Periodic Properties of the Elements90
- Ch.10 - Chemical Bonding I: The Lewis Model89
- Ch.11 - Chemical Bonding II: Molecular Shapes, VSEPR & MO Theory85
- Ch.12 - Liquids, Solids & Intermolecular Forces51
- Ch.13 - Solids & Modern Materials47
- Ch.14 - Solutions90
- Ch.15 - Chemical Kinetics115
- Ch.16 - Chemical Equilibrium68
- Ch.17 - Acids and Bases136
- Ch.18 - Aqueous Ionic Equilibrium153
- Ch.19 - Free Energy & Thermodynamics93
- Ch.20 - Electrochemistry106
- Ch.21 - Radioactivity & Nuclear Chemistry74
- Ch.22 - Organic Chemistry140
Tro6th EditionChemistry: A Molecular ApproachISBN: 9780137832217Non è quello che usi tu?Cambia libro di testo
Capitolo 10, Problema 89
Ethane burns in air to form carbon dixode and water vapor.
2 H3C¬CH3( g) + 7 O2( g)¡4 CO2( g) + 6 H2O( g)
Use average bond energies to calculate ΔHrxn for the reaction.
Guida verificata passo dopo passo1
Identify the bonds broken in the reactants: In ethane (C2H6), there are C-C and C-H bonds. In O2, there are O=O bonds.
Identify the bonds formed in the products: In CO2, there are C=O bonds. In H2O, there are O-H bonds.
Use the average bond energies to calculate the total energy required to break the bonds in the reactants. This involves multiplying the number of each type of bond by its bond energy and summing them up.
Use the average bond energies to calculate the total energy released when the bonds in the products are formed. Again, multiply the number of each type of bond by its bond energy and sum them up.
Calculate the enthalpy change (ΔH_rxn) for the reaction using the formula: ΔH_rxn = (Total energy of bonds broken) - (Total energy of bonds formed).
Risposta video verificata per un problema simile:
Questa soluzione video è stata consigliata dai nostri tutor come utile per risolvere questo problema.
Concetti chiave
Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.
Bond Energies
Bond energies refer to the amount of energy required to break a bond between two atoms in a molecule. In chemical reactions, the total energy required to break the bonds in the reactants is compared to the energy released when new bonds are formed in the products. This concept is crucial for calculating the enthalpy change (ΔHrxn) of a reaction, as it allows us to estimate the energy changes associated with bond breaking and forming.
Video consigliato:
Percorso guidato
01:50
Bond Energy
Enthalpy Change (ΔHrxn)
The enthalpy change (ΔHrxn) of a reaction is the difference in energy between the products and the reactants, indicating whether a reaction is exothermic (releases heat) or endothermic (absorbs heat). It can be calculated using the formula ΔHrxn = Σ(Bond Energies of Reactants) - Σ(Bond Energies of Products). Understanding this concept is essential for predicting the energy dynamics of the combustion of ethane.
Video consigliato:
Percorso guidato
02:34Enthalpy of Formation
Combustion Reaction
A combustion reaction is a chemical reaction that typically involves a hydrocarbon reacting with oxygen to produce carbon dioxide and water, releasing energy in the form of heat and light. In the case of ethane, the balanced equation shows that it reacts with oxygen to produce carbon dioxide and water vapor. Recognizing the characteristics of combustion reactions is important for applying bond energy calculations to determine the overall energy change.
Video consigliato:
Percorso guidato
02:24Combustion Apparatus
Pratica correlata
Domanda del libro di testo
Write an appropriate Lewis structure for each compound. Make certain to distinguish between ionic and molecular compounds. b. ClF5
586
views
Domanda del libro di testo
In the Chemistry and the Environment box on free radicals in this chapter, we discussed the importance of the hydroxyl radical in reacting with and eliminating many atmospheric pollutants. However, the hydroxyl radical does not clean up everything. For example, chlorofluorocarbons—which destroy stratospheric ozone—are not attacked by the hydroxyl radical. Consider the hypothetical reaction by which the hydroxyl radical might react with a chlorofluorocarbon: OH(g) + CF2Cl2(g) → HOF(g) + CFCl2(g) Use bond energies to explain why this reaction is improbable. (The C–F bond energy is 552 kJ/mol.)
734
views
Domanda del libro di testo
Hydrogenation reactions are used to add hydrogen across double bonds in hydrocarbons and other organic compounds. Use average bond energies to calculate ΔHrxn for the hydrogenation reaction. H2C=CH2(g) + H2(g) → H3C–CH3(g)
2669
views
1
rank
Domanda del libro di testo
Which of the two compounds, H2NNH2 and HNNH, has the strongest nitrogen-nitrogen bond, and which has the shorter nitrogen-nitrogen bond.
1937
views